The XS comes with an 18-55mm IS f/3.5-5.6. It is a decent lens. Not super great, but still capable of good shots if you know how to work with it (plenty of light, and close the aperture down a bit, pay attention to your focus points).

That being said, it is still a kit lens (meaning that almost anything you replace it with in the same zoom range will perform better).

Whether you have a nikon or canon or sony or pentax or whatever..... the most determining factor for image quality is the lens on the camera, next are the settings you are using, third is the shot composition/subject, and fourth is the camera body.

There's nothing wrong with the XS